使用 MvcMiniProfiler 监控EF 4.1 with MySQL Provider

本文有2个不怎么相关的话题，一是用MVCMiniProfiler 监控EF4.1，另一个则是为MvcMiniProfiler提供MySQL Provider的支持。

需要在Web.config中添加system.data的节点

[code]   1: <remove invariant="MvcMiniProfiler.Data.ProfiledDbProvider" />

2: <add name="MvcMiniProfiler.Data.ProfiledDbProvider" invariant="MvcMiniProfiler.Data.ProfiledDbProvider"

3:         description="MvcMiniProfiler.Data.ProfiledDbProvider"

4:         type="MvcMiniProfiler.Data.ProfiledDbProviderFactory, MvcMiniProfiler, Version=1.7.0.0, Culture=neutral, PublicKeyToken=b44f9351044011a3" />

[/code]

另外在Application_Start设置Database.DefaultConnectionFactory即可

[code]   1: var factory = new SqlCeConnectionFactory("System.Data.SqlServerCe.4.0");

2: var profiled = new MvcMiniProfiler.Data.ProfiledDbConnectionFactory(factory);

3: Database.DefaultConnectionFactory = profiled;

[/code]

当然，使用MySQL的话需要使用MySQL的ConnectionFactory，但是MySQL没有为我们提供，所以我们就自己写一下

[code]   1: class MySqlConnectionFactory : IDbConnectionFactory

2:         {

3:             public DbConnection CreateConnection(string nameOrConnectionString)

4:             {

5:                 using (MiniProfiler.Current.Step("创建Connection:" + nameOrConnectionString))

6:                 {

7:                     var connStr = ConfigurationManager.ConnectionStrings[nameOrConnectionString];

8:                     return new MySqlConnection(connStr.ConnectionString);

9:                 }

10:             }

11:         }

[/code]

然后使用MySqlConnectionFactory来注册

[code]   1: var factory = new MySqlConnectionFactory();

2: var profiled = new ProfiledDbConnectionFactory(factory);

3: Database.DefaultConnectionFactory = profiled;

[/code]

但是有很多时候使用EF4.1这样做并不会生效我们可能还要为DbContext包装一个基类来实现如下功能

[code]   1: abstract public class BaseDbContext :DbContext

2:    {

3:        protected BaseDbContext(string nameOrConnectionString)

4:            : base(GetConnection(nameOrConnectionString),true)

5:        {

6:

7:        }

8:

9:        private static DbConnection GetConnection(string nameOrConnectionString)

10:        {

11:            if( Database.DefaultConnectionFactory is SqlConnectionFactory)

12:            {//这个判断是为了解决未使用MySqlConnectionFactory时自动使用SQLServer的问题

13:                var connStr = ConfigurationManager.ConnectionStrings[nameOrConnectionString];

14:                return new MySqlConnection(connStr.ConnectionString);

15:            }

16:            return Database.DefaultConnectionFactory.CreateConnection(nameOrConnectionString);

17:        }

18: }

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